Testnetwork is able to rotate through a stream of peers

[williambanfield]

Currently, the testnetwork is able to generate a network and run it. However, a commonly observed configuration in live networks is that peers come and go frequently. This may cause instability in the network. Information about these ephemeral peers will be gossiped but nodes may never be able to connect to them. The information will be retained by the PEX reactor long after the nodes have completely left the network.

We should modify the test network scripts to be able to rotate in peers. This should take the form of a small program, script or similar, that adds and removes nodes to the network. It will need to repeatedly add new digital ocean instances with newly generated tendermint configuration information and then completely destroy these nodes.